Vacuum switch circuit breaker

Abstract

The invention relates to a vacuum switch circuit breaker. The vacuum switch circuit breaker comprises a protective shell and a supporting shell, the double-tube vacuum bag is positioned in the shell and comprises a vacuum arc extinguish chamber and a vacuum insulation chamber; wherein the vacuum arc-extinguishing chamber comprises a static conducting rod and a movable conducting rod, the static conducting rod comprises a first penetrating end and a first contact end, the first penetrating end penetrates through one end of the vacuum arc-extinguishing chamber, the movable conducting rod comprises a second penetrating end and a second contact end, and the second penetrating end penetrates through the other end of the vacuum arc-extinguishing chamber and extends to the vacuum insulation chamber; the first contact end of the static conducting rod and the second contact end of the movable conducting rod are oppositely arranged and are spaced by a distance; the vacuum insulation chamber comprises an insulation push rod, one end of the insulation push rod penetrates through the other end of the vacuum insulation chamber, and the other end of the insulation push rod is connected with the second penetrating end of the movable conducting rod; and the transmission and control mechanism is connected with one end of the insulating push rod. By arranging the vacuum insulation chamber, the insulation push rod is packaged, and the insulation performance is better.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum switch tubes, and in particular relates to a vacuum switch circuit breaker. Background Art

[0002] At present, vacuum circuit breakers are used as the main circuit breakers of vehicles to connect and disconnect the main circuits of vehicles and are part of the vehicle traction system.

[0003] The prior art (CN107946130A) discloses a horizontal integrated insulated vacuum circuit breaker, comprising a low-voltage control part, a base plate assembly, a spring bracket assembly, an insulating push rod, a vacuum switch assembly and an insulator, wherein the low-voltage control part is mounted at the bottom of the base plate assembly, and the low-voltage control part is connected to the vacuum switch tube assembly through the spring bracket assembly and the insulating push rod. The insulator is an integrated structure that provides both inter-pole insulation and ground insulation. One end of the integrated insulator is connected to the base plate assembly through a support, and the axis of the integrated insulator is parallel to the base plate assembly.

[0004] However, in the related art, there is a problem that the insulating push rod is directly assembled with the vacuum switch tube, and the insulation performance of the single-bulb structure is low. Summary of the invention

[0005] In view of the deficiencies existing in the related art, the present invention provides a vacuum switch circuit breaker to simplify the structure of the vacuum switch circuit breaker, making the structure more compact and having higher insulation performance, so as to solve the problem of low insulation performance of the single-bubble structure.

[0006] The present invention provides a vacuum switch circuit breaker, comprising:

[0007] The housing comprises a protective shell and a supporting shell, wherein the interior of the protective shell is hollow, and the supporting shell is located inside the protective shell and connected to the inner side of the protective shell;

[0008] A double-tube vacuum bag is located inside the supporting shell and connected to the supporting shell, and includes a vacuum interrupter chamber and a vacuum insulation chamber, and the vacuum interrupter chamber and the vacuum insulation chamber are connected;

[0009] Wherein, the vacuum interrupter comprises a static conductive rod and a dynamic conductive rod, the static conductive rod comprises a first penetration end and a first contact end, the first penetration end penetrates one end of the vacuum interrupter, the dynamic conductive rod comprises a second penetration end and a second contact end, the second penetration end penetrates the other end of the vacuum interrupter, extends to the vacuum insulation chamber, and penetrates one end of the vacuum insulation chamber, the first contact end of the static conductive rod and the second contact end of the dynamic conductive rod are arranged opposite to each other and spaced apart;

[0010] The vacuum insulation chamber comprises an insulating push rod, one end of which penetrates the other end of the vacuum insulation chamber, and the other end of the insulating push rod is connected to the second penetration end of the moving conductive rod;

[0011] The drive and control mechanism is connected to one end of the insulating push rod.

[0012] The housing improves the overall stability. The double-tube vacuum package cooperates with the drive and control mechanism to achieve precise control of the moving conductive rod, ensuring the accuracy of opening and closing operations and improving the operating stability of the equipment.

[0013] In some embodiments, the static conductive rod includes a first protrusion, a second protrusion, and a first straight section. The first protrusion is located at the penetrating end of the static conductive rod and outside the vacuum arc extinguishing chamber. The second protrusion is located at the contact end of the static conductive rod and inside the vacuum arc extinguishing chamber. The two ends of the first straight section are respectively connected to the first protrusion and the second protrusion.

[0014] The moving conductive rod includes a third protrusion, a fourth protrusion, and a second straight section. The third protrusion is located at the second contact end of the moving conductive rod and inside the vacuum arc extinguishing chamber. The fourth protrusion is located at the second penetrating end of the moving conductive rod and inside the vacuum insulation chamber. The two ends of the second straight section are respectively connected to the third protrusion and the fourth protrusion. The second straight section penetrates through the vacuum arc extinguishing chamber and extends into the vacuum insulation chamber.

[0015] Wherein, when the vacuum switch circuit breaker is in the state of interrupting current, the third protrusion and the second protrusion are arranged opposite to each other with a spacing distance. When the vacuum switch circuit breaker is in the state of conducting current, the third protrusion and the second protrusion are in contact.

[0016] During the opening and closing process, the third protrusion and the second protrusion contact or separate according to the switch state, ensuring the reliable connection and disconnection of the circuit and improving the working efficiency and stability of the equipment.

[0017] In some embodiments, the vacuum arc extinguishing chamber further includes:

[0018] A shielding cover, located on both sides of the third protrusion and the second protrusion, in an arc shape, connected to the first cylinder body on one side and covering the part opposite to the third protrusion and the second protrusion on the other side.

[0019] During the opening and closing process, the shielding cover effectively shields the arc, reduces the damage to surrounding components, and prolongs the service life of internal components of the equipment.

[0020] In some embodiments, the vacuum arc extinguishing chamber further includes:

[0021] A first cylinder body, in a hollow tubular shape, connected to the vacuum insulation chamber at one end;

[0022] A first cover plate, located between the first cylinder body and the support housing. The edge of the first cover plate is hermetically connected to the end of the first cylinder body away from the vacuum insulation chamber. The first penetrating end of the static conductive rod passes through the first cover plate. Part of the first penetrating end is located on the side of the first cover plate away from the vacuum insulation chamber, and part of the first penetrating end is located on the side of the first cover plate close to the vacuum insulation chamber.

[0023] A second cover plate is installed at the junction of the vacuum interrupter and the vacuum insulation chamber, and the second through end of the moving conducting rod passes through the second cover plate.

[0024] The first cylinder body cooperates with the first cover plate and the second cover plate to maintain the sealed vacuum environment of the vacuum interrupter and the vacuum insulation chamber, ensuring that the insulation performance and arc extinguishing effect of the equipment are not affected and extending the service life of the equipment.

[0025] In some embodiments, the vacuum interrupter further includes:

[0026] A corrugated pipe, which is wavy, is sleeved on the outside of the moving conducting rod and connected to the second cover plate.

[0027] During the opening and closing operations, the corrugated pipe expands and contracts with the movement of the moving conducting rod to compensate for the axial displacement of the moving conducting rod and ensure the smooth progress of the opening and closing operations.

[0028] In some embodiments, the vacuum interrupter further includes:

[0029] A guide sleeve is sleeved on the outside of the moving conducting rod, located between the moving conducting rod and the corrugated pipe, and connected to the second cover plate.

[0030] The guide sleeve provides guidance and support for the moving conducting rod, ensuring that the moving conducting rod moves in a straight line during the opening and closing processes, avoiding deviation and shaking, and improving the accuracy and stability of the opening and closing operations.

[0031] In some embodiments, the double-tube vacuum package further includes:

[0032] A high-voltage electrode, located at the junction of the vacuum interrupter and the vacuum insulation chamber;

[0033] A flexible conducting strip, located inside the vacuum insulation chamber, is bent, one end is connected to the high-voltage electrode, and the other end is connected to the second through end of the moving conducting rod.

[0034] The setting of the high-voltage electrode and the flexible conducting strip realizes the efficient transmission of current between the vacuum interrupter and the vacuum insulation chamber.

[0035] In some embodiments, the double-tube vacuum package is provided with a plurality of openings, and between the plurality of openings and the support housing, there is further included:

[0036] A conductor structure, located between the double-tube vacuum package and the support housing, the conductor structure is connected to the support housing, and a conical opening is provided at the connection of the conductor structure and the support housing and on the support housing at the connection, and one end of the conical opening communicates with the opening on the double-tube vacuum package;

[0037] Among them, the conductor structure includes:

[0038] The connecting piece is located at the opening of the double-tube vacuum package;

[0039] The grading ring is located on the circumferential side of the opening of the double-tube vacuum package and on the circumferential side of the other end of the conical opening;

[0040] The watchband is located inside the conical opening.

[0041] The conductor structure provides space and path for the electrical connection between the double-tube vacuum package and external equipment.

[0042] In some of these embodiments, a grounding wire is provided between the support housing and the protection housing. The support housings on both sides of the vacuum interrupter are recessed inward. A first cavity is formed between the support housing and the protection housing. Inside the first cavity includes:

[0043] The current transformer is fixed inside the protection housing and is connected to the protection housing and the grounding wire respectively through wires.

[0044] The current transformer monitors the leakage current between the support housing and the protection housing in real time, realizing the real-time monitoring of the leakage current.

[0045] In some of these embodiments, the support housings on both sides of the vacuum interrupter are recessed inward. A second cavity is formed between the support housing and the protection housing. Inside the second cavity includes:

[0046] The temperature sensor is located on one side of the second cavity close to the vacuum interrupter and is connected to the support housing.

[0047] The temperature sensor monitors the temperature around the vacuum interrupter in real time, prevents equipment failures caused by overheating, and extends the service life of the equipment.

[0048] Based on the above technical solutions, in the embodiments of the present invention, by placing the insulating push rod in the vacuum insulation chamber, the electrical clearance and creepage distance are greatly reduced, the size of the insulating push rod can be reduced, and thus the size of the vacuum circuit breaker can be reduced. In addition, setting the temperature sensor can monitor the working state of the vacuum circuit breaker, and the current transformer can monitor the leakage current of the epoxy body of the vacuum circuit breaker to monitor the insulation state. Description of the Drawings

[0049] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0050] Figure 1 It is a schematic structural diagram of an embodiment of the vacuum circuit breaker of the present invention;

[0051] Figure 2 It is a schematic structural diagram of an embodiment of the vacuum circuit breaker of the present invention.

[0052] In the figure:

[0053] 101, support housing; 102, conductor structure; 1021, first mounting bolt; 1022, grading ring; 1023, watch band; 1024, embedded groove; 103, first wire sleeve; 1031, second mounting bolt; 1032, first ground wire; 104, conical opening; 2, double-tube vacuum package; 3, insulating layer; 4, protective housing; 401, second ground wire; 402, second wire sleeve; 403, metal skin; 5, current transformer; 6, temperature sensor; 7, transmission and control mechanism; 701, first connecting member; 702, second connecting member; 8, gasket; 9, flexible conductive strip; 10, insulating member; 11, insulating push rod; 12, first bellows; 13, third cover plate; 14, guide sleeve; 15, bellows; 16, first cylinder; 17, shielding cover; 18, first cover plate; 19, second cylinder; 20, moving conductive rod; 2001, third protrusion; 2002, fourth protrusion; 2003, second straight section; 21, static conductive rod; 2101, first protrusion; 2102, second protrusion; 2103, first straight section; 22, second cover plate; 23, high-voltage electrode. Detailed implementation manners

[0054] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0055] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0056] The terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", and "third" may explicitly or implicitly include one or more of such features.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Domestic bullet trains and suburban trains mostly adopt the 25 kV power supply system, and generally use a 25 kV vacuum circuit breaker as the main circuit breaker of the vehicle. The 25 kV vacuum circuit breaker is composed of components such as support insulators, vacuum switch tubes, control mechanisms, and transmission structures. The high-voltage incoming line and the high-voltage outgoing line adopt the form of copper bar bolt connection. The insulator is used as a support to ensure the electrical clearance and creepage distance from the high-voltage live point to the ground potential at the same time. The outgoing line, incoming line of such a vacuum circuit breaker are in contact with air, and its insulation performance is greatly affected by the environment, especially by the altitude.

[0059] In a high-altitude environment, higher electrical clearance and creepage distance are required to ensure the insulation strength of the vacuum circuit breaker. Therefore, the vacuum circuit breaker requires a larger installation space, but there is no larger space available on the train.

[0060] In order to adapt to the installation space on the train, the vacuum switch tube of the prior art is mainly fixedly connected by a brazing process with structures such as a moving conductive rod, a guide sleeve, a bellows, moving / static contacts, a shielding cover, a static conductive rod, and a porcelain cylinder housing. This structure only has one vacuum arc extinguishing chamber. Such a structure requires an external insulating push rod device to complete the closing and opening of the moving / static contacts of the vacuum switch tube.

[0061] Since the external insulating push rod is a movable structure and is placed in the air, it is impossible to perform solid insulation potting on the live body of the moving contact of the vacuum switch tube. And due to the requirements of the 25 kV voltage level and the electrical clearance and creepage distance of the live part of the moving conductive rod, the length of the insulating push rod is limited, and it is impossible to further miniaturize the design of the vacuum circuit breaker.

[0062] For the high-altitude operating environment, the length of the insulating push rod conflicts with the limited installation space of the train. To solve the above problems, the present application provides a vacuum switch circuit breaker.

[0063] As Figure 1 and Figure 2 shown, in a schematic embodiment of the vacuum switch circuit breaker of the present invention, the vacuum switch circuit breaker includes:

[0064] A housing, including a protective housing 4 and a support housing 101. The protective housing 4 is hollow inside, and the support housing 101 is located inside the protective housing 4 and is connected to the inner side of the protective housing 4.

[0065] The double - tube vacuum package 2 is located inside the support housing 101 and is connected to the support housing 101. It includes a vacuum arc - extinguishing chamber and a vacuum insulation chamber, and the vacuum arc - extinguishing chamber and the vacuum insulation chamber are connected.

[0066] Among them, the vacuum arc - extinguishing chamber includes a static conducting rod 21 and a moving conducting rod 20. The static conducting rod 21 includes a first penetrating end and a first contact end. The first penetrating end penetrates one end of the vacuum arc - extinguishing chamber. The moving conducting rod 20 includes a second penetrating end and a second contact end. The second penetrating end penetrates the other end of the vacuum arc - extinguishing chamber, extends into the vacuum insulation chamber, and penetrates one end of the vacuum insulation chamber. The first contact end of the static conducting rod 21 and the second contact end of the moving conducting rod 20 are oppositely arranged and spaced apart.

[0067] The vacuum insulation chamber includes an insulating push rod 11. One end of the insulating push rod 11 penetrates the other end of the vacuum insulation chamber, and the other end of the insulating push rod 11 is connected to the second penetrating end of the moving conducting rod 20.

[0068] The drive and control mechanism 7 is connected to one end of the insulating push rod 11.

[0069] When the circuit needs to be closed, the drive and control mechanism 7 drives the insulating push rod 11 to move forward, driving the second contact end of the moving conducting rod 20 to approach the first contact end of the static conducting rod 21 until they contact, and the circuit is conducted. When the circuit needs to be disconnected, the drive and control mechanism 7 drives the insulating push rod 11 to move backward, driving the second contact end of the moving conducting rod 20 to separate from the first contact end of the static conducting rod 21. At this time, an arc will be generated in the vacuum arc - extinguishing chamber. Due to the good arc - extinguishing performance of the vacuum environment, the arc will quickly extinguish, thus realizing the disconnection of the circuit.

[0070] In the above - mentioned exemplary embodiment, the protective housing 4 provides reliable physical support for the vacuum switch circuit breaker, improving the overall stability. The support housing 101 not only buffers the vibration generated by the internal components during operation, reduces the damage of mechanical stress to the equipment, and extends the service life of the equipment, but also has insulating properties, enhancing the insulation protection ability of the equipment. The vacuum arc - extinguishing chamber efficiently extinguishes the arc generated during closing and opening. The vacuum insulation chamber ensures the insulation performance inside the equipment, effectively avoiding circuit failures and electrical accidents caused by the arc, and greatly improving the safety performance and reliability of the equipment. The drive and control mechanism 7 is connected to the insulating push rod 11, realizing precise control of the moving conducting rod 20, ensuring the accuracy of closing and opening operations, and improving the operation stability of the equipment.

[0071] The protective housing 4 can be set as a metal housing.

[0072] The support housing 101 can be made of epoxy resin. A conductive paint is applied to the surface of the support housing 101. The support housing 101 bears not only mechanical stress but also the electrical stress of the vacuum switch circuit breaker.

[0073] A gasket 8 is provided between the support housing 101 and the protective housing 4 to maintain the sealing performance between the protective housing 4 and the support housing 101.

[0074] A plurality of first wire sleeves 103 and a plurality of second wire sleeves 402 are provided on the protective housing 4, and both the first wire sleeves 103 and the second wire sleeves 402 are located inside the support housing 101.

[0075] The first wire sleeve 103 cooperates with the second mounting bolt 1031 to connect and fix the support housing 101 and the protective housing 4. The second mounting bolt 1031 connects the protective housing 4 and the support housing 101, and the first wire sleeve 103 and the second mounting bolt 1031 cooperate with each other to improve the structural stability.

[0076] The second wire sleeve 402 is used for fixedly connecting the vacuum switch circuit breaker and the external high-voltage cable terminal.

[0077] A plurality of through-long round holes are provided on the protective housing 4 for fixedly connecting the protective housing 4 and the double-tube vacuum package 2.

[0078] An insulating layer 3 is provided between the double-tube vacuum package 2 and the support housing 101, which can be set as liquid silicone rubber, for buffering vibration during the operation of the vacuum switch circuit breaker and protecting the internal double-tube vacuum package 2.

[0079] The insulating push rod 11 is placed in the vacuum insulating chamber, the electrical clearance and creepage distance are reduced, the size of the insulating push rod 11 can be reduced, and thus the size of the vacuum switch circuit breaker can be reduced. Compared with the traditional single-vacuum-bubble structure in the prior art, the volume of the double-tube vacuum package 2 in this application can be reduced by 50%.

[0080] The transmission and control mechanism 7 includes a transmission shaft, a cylinder assembly, a quick exhaust valve, a solenoid valve, an air cylinder, a pressure switch, a pressure reducing valve, and a microswitch. The transmission shaft is connected to the insulating push rod 11. By controlling the on-off of the solenoid valve, the air pressure of the cylinder assembly is controlled, and then the transmission shaft is controlled to push the insulating push rod 11 to control the opening and closing of the vacuum switch circuit breaker. The cylinder assembly is connected to the support housing 101 through the first connecting member 701 and connected to the insulating push rod 11 through the second connecting member 702, and the other devices of the transmission and control mechanism 7 are arranged on the cylinder assembly.

[0081] In some embodiments, the static conductive rod 21 includes a first protrusion 2101, a second protrusion 2102, and a first straight section 2103. The first protrusion 2101 is located at the penetrating end of the static conductive rod 21 and outside the vacuum arc extinguishing chamber, the second protrusion 2102 is located at the contact end of the static conductive rod 21 and inside the vacuum arc extinguishing chamber, and the two ends of the first straight section 2103 are respectively connected to the first protrusion 2101 and the second protrusion 2102.

[0082] The moving conductive rod 20 includes a third protrusion 2001, a fourth protrusion 2002, and a second straight section 2003. The third protrusion 2001 is located at the second contact end of the moving conductive rod 20 and inside the vacuum interrupter. The fourth protrusion 2002 is located at the second through end of the moving conductive rod 20 and inside the vacuum insulation chamber. The two ends of the second straight section 2003 are respectively connected to the third protrusion 2001 and the fourth protrusion 2002. The second straight section 2003 penetrates through the vacuum interrupter and extends into the vacuum insulation chamber.

[0083] Wherein, when the vacuum switch circuit breaker is in the state of interrupting current, the third protrusion 2001 and the second protrusion 2102 are arranged opposite to each other with a spacing distance. When the vacuum switch circuit breaker is in the state of conducting current, the third protrusion 2001 is in contact with the second protrusion 2102.

[0084] When the vacuum switch circuit breaker is in the state of interrupting current, the third protrusion 2001 and the second protrusion 2102 are arranged opposite to each other and maintain a certain spacing distance. At this time, the circuit is in an open state. When the vacuum switch circuit breaker is in the state of conducting current, the transmission and control mechanism 7 drives the moving conductive rod 20 to move, so that the third protrusion 2001 is in close contact with the second protrusion 2102, the circuit is turned on, and the current can smoothly pass through the static conductive rod 21 and the moving conductive rod 20.

[0085] The first protrusion 2101 and the third protrusion 2001 facilitate the contact between the moving conductive rod 20 and the static conductive rod 21, increase the contact area, reduce the contact resistance, and thus reduce the energy loss. During the closing and opening processes, the third protrusion 2001 and the second protrusion 2102 are in contact or separated according to the switch state, ensuring the reliable connection and disconnection of the circuit, and improving the working efficiency and stability of the equipment.

[0086] The third protrusion 2001 and the second protrusion 2102 play the role of interrupting and conducting current, and they have electrical conductivity, electrical endurance, and anti-welding properties.

[0087] In some embodiments, the vacuum interrupter further includes:

[0088] A shielding cover 17, located on both sides of the third protrusion 2001 and the second protrusion 2102, is arc-shaped, connected to the first cylinder 16 on one side, and covering the part of the third protrusion 2001 and the second protrusion 2102 that are opposite to each other on the other side.

[0089] During the opening and closing processes, the shielding cover 17 effectively shields the arc, reduces damage to surrounding components, and extends the service life of the internal components of the equipment. At the same time, it improves the electric field distribution inside the vacuum interrupter, reduces the non-uniformity of the electric field distribution, makes the arc extinction more stable, improves the arc extinguishing performance, and further enhances the safety and reliability of the equipment. In addition, the shielding cover 17 can also collect the metal vapor generated by the arc, preventing it from adhering to other components and affecting the performance of the circuit breaker.

[0090] The shielding cover 17 is made of metal, condenses and adsorbs the metal vapor generated when the vacuum switch circuit breaker closes or breaks the current, makes it precipitate and adhere to the inner side of the shielding cover 17, reduces the splashing on the inner wall of the first cylinder 16 of the porcelain cylinder, avoids reducing the insulation function of the first cylinder 16, and improves the electric field distribution inside the vacuum interrupter.

[0091] In some embodiments, the vacuum interrupter further includes:

[0092] The first cylinder 16 is in a hollow tubular shape and is connected to the vacuum insulation chamber at one end.

[0093] The first cover plate 18 is located between the first cylinder 16 and the support housing 101. The edge of the first cover plate 18 is hermetically connected to the end of the first cylinder 16 away from the vacuum insulation chamber. The first through end of the static conduction rod passes through the first cover plate 18, and part of the first through end is located on the side of the first cover plate 18 away from the vacuum insulation chamber, and part of the first through end is located on the side of the first cover plate 18 close to the vacuum insulation chamber.

[0094] The second cover plate 22 is installed at the junction of the vacuum interrupter and the vacuum insulation chamber. The second through end of the moving conduction rod 20 passes through the second cover plate 22.

[0095] The first cylinder 16 provides a stable structural support for the vacuum interrupter and guarantees the installation space for the internal components. The first cover plate 18 and the second cover plate 22 achieve the sealing at the penetration points of the static conduction rod 21 and the moving conduction rod 20, effectively prevent vacuum leakage, maintain the sealed vacuum environment of the vacuum interrupter and the vacuum insulation chamber, ensure that the insulation performance and arc extinguishing effect of the equipment are not affected, and extend the service life of the equipment.

[0096] In some embodiments, the vacuum interrupter further includes:

[0097] The bellows 15 is in a wavy shape, is sleeved on the outside of the moving conduction rod 20, and is connected to the second cover plate 22.

[0098] The design of the bellows 15 realizes the dual functions of the movement of the moving conductive rod 20 and vacuum sealing. During the opening and closing operations, the bellows 15 expands and contracts with the movement of the moving conductive rod 20, compensating for the axial displacement of the moving conductive rod 20 to ensure the smooth progress of the opening and closing operations. At the same time, the vacuum seal of the vacuum interrupter is always maintained to prevent external air from entering, ensuring the arc extinguishing performance and insulation performance of the equipment.

[0099] The dimensions of the wave crests and wave troughs of the bellows 15 can be designed according to the movement stroke of the moving conductive rod 20 to ensure that it can undergo elastic deformation when the moving conductive rod 20 moves, while maintaining good sealing performance.

[0100] The bellows 15 is made of stainless steel. When the moving conductive rod 20 moves, the bellows 15 expands and contracts along the direction of the movement of the moving conductive rod 20, maintaining the vacuum seal of the inner cavity of the vacuum interrupter.

[0101] In some embodiments, the vacuum interrupter further includes:

[0102] A guide sleeve 14, sleeved on the outside of the moving conductive rod 20, located between the moving conductive rod 20 and the bellows 15, and connected to the second cover plate 22.

[0103] The guide sleeve 14 provides guidance and support for the moving conductive rod 20, ensuring that the moving conductive rod 20 maintains a straight movement during the opening and closing processes, avoiding deviation and shaking, improving the accuracy and stability of the opening and closing operations. In addition, it reduces the friction between the moving conductive rod 20 and the bellows 15, extends the service life of the bellows 15, and reduces the maintenance cost of the equipment.

[0104] The guide sleeve 14 has a guiding function to ensure that the moving conductive rod 20 can move linearly along the axis during the opening and closing movement process. At the same time, the guide sleeve 14 is made of an insulating material to prevent the current of the conductive circuit from being shunted to the bellows 15, thus affecting the life of the bellows 15.

[0105] In some embodiments, the vacuum insulation chamber further includes:

[0106] A second cylinder 19, in a hollow tubular shape, with one end connected to the edge of the second cover plate 22 of the vacuum interrupter.

[0107] A third cover plate 13, located at the other end of the second cylinder 19, with the edge of the third cover plate 13 hermetically connected to the end of the second cylinder 19 away from the vacuum interrupter, and the insulating push rod 11 passing through the third cover plate 13.

[0108] An insulating member 10, in a curved shape, sleeved on the outside of the insulating push rod 11, located between the second cover plate 22 and the third cover plate 13. The insulating member 10 is used to increase the creepage distance of the double-tube vacuum package 2 and improve the insulation performance.

[0109] Between the insulating part 10 and the third cover plate 13, a first bellows 12 is provided, which is sleeved outside the insulating push rod 11. One end of the first bellows 12 is connected to the outside of the insulating push rod 11, and the other end is connected to the third cover plate 13.

[0110] In some embodiments, the double-tube vacuum package 2 further includes:

[0111] A high-voltage electrode 23, located at the connection between the vacuum arc extinguishing chamber and the vacuum insulating chamber.

[0112] A flexible conductive strip 9, located inside the vacuum insulating chamber, is bent, with one end connected to the high-voltage electrode 23 and the other end connected to the second through end of the moving conductive rod 20.

[0113] The arrangement of the high-voltage electrode 23 and the flexible conductive strip 9 enables efficient transmission of current between the vacuum arc extinguishing chamber and the vacuum insulating chamber. The bent design and good flexibility of the flexible conductive strip 9 allow it to deform flexibly when the moving conductive rod 20 moves, ensuring the stability of current transmission, avoiding interruption or instability of current transmission caused by the movement of the moving conductive rod 20, and enhancing the working reliability of the device.

[0114] Two high-voltage electrodes 23 are respectively arranged on both sides of the connection between the vacuum arc extinguishing chamber and the vacuum insulating chamber, having a current guiding function, and are connected and fixed to the connection between the vacuum arc extinguishing chamber and the vacuum insulating chamber through bolts and metal fittings.

[0115] The flexible conductive strip 9 connects the two high-voltage electrodes 23 and the moving conductive rod 20, serving as an electrical connection.

[0116] In some embodiments, the double-tube vacuum package 2 is provided with a plurality of openings. Between the plurality of openings and the support housing 101, there is also included:

[0117] A conductor structure 102, located between the double-tube vacuum package 2 and the support housing 101. The conductor structure 102 is connected to the support housing 101. A conical opening 104 is provided at the connection between the conductor structure 102 and the support housing 101 and on the support housing 101 at the connection, and one end of the conical opening 104 communicates with the opening on the double-tube vacuum package 2.

[0118] Among them, the conductor structure 102 includes:

[0119] A connecting member, located at the opening on the double-tube vacuum package 2.

[0120] A grading ring 1022, located on the periphery of the opening on the double-tube vacuum package 2 and on the periphery of the other end of the conical opening 104.

[0121] A strap 1023, located inside the conical opening 104.

[0122] The conductor structure 102 provides space and a path for the electrical connection between the double-tube vacuum package 2 and external equipment. Among them, the connecting piece ensures the reliability of the electrical connection. The grading ring 1022 and the strap 1023 evenly distribute the electric field, reduce the phenomenon of electric field concentration, lower the possibility of corona discharge, improve the electrical insulation performance of the equipment, enhance the anti-interference ability of the equipment, and ensure the stable operation of the equipment in a complex electromagnetic environment.

[0123] Three sets of cable terminal inlet tapered openings and two sets of outlet tapered interfaces are provided at the connection between the conductor structure 102 and the support housing 101 and on the support housing 101 at the connection.

[0124] The material of the conductor structure 102 is copper, which can play the role of transmitting current.

[0125] The conductor structure 102 further includes a first mounting bolt 1021. Through the first mounting bolt 1021, the conductor structure 102 is connected to the electrode of the double-tube vacuum package 2.

[0126] In the conductor structure 102, an embedded groove 1024 is provided for embedding the strap 1023. The pressure terminal of the external equipment is electrically connected to the vacuum circuit breaker through the strap 1023.

[0127] The strap 1023 is in a ring shape. The outer side of the strap 1023 is connected to the embedded groove 1024, and the inner side is connected to the pressure terminal of the external equipment to achieve current conduction.

[0128] The material of the strap 1023 is metal.

[0129] The mounting bolt, the grading ring 1022, the embedded groove 1024, and the strap 1023 form a stable current transmission structure.

[0130] In some embodiments, a grounding wire is provided between the support housing 101 and the protection housing 4. The support housing 101 on both sides of the vacuum interrupter is recessed inward. A first cavity is formed between the support housing 101 and the protection housing 4. Inside the first cavity, there are:

[0131] A current transformer 5, fixed to the inner side of the protection housing 4, is connected to the protection housing 4 and the grounding wire through wires respectively.

[0132] The current transformer 5 monitors the leakage current between the support housing 101 and the protection housing 4 in real time. It not only realizes the real-time monitoring of the leakage current, facilitating the staff to understand the operating state of the vacuum circuit breaker, but also can trigger the protection device in time in case of an emergency, cut off the circuit, prevent damage to the equipment caused by overcurrent, and improve the operating safety and reliability of the equipment.

[0133] In some embodiments, the grounding wire includes a first grounding wire 1032 and a second grounding wire 401.

[0134] One end of the first grounding wire 1032 is located between the conductive paint on the surface of the support housing 101 and the protective housing 4, and the other end is connected to the current transformer 5.

[0135] One end of the second grounding wire 401 is connected to the protective housing 4, and the other end is connected to the current transformer 5.

[0136] In some embodiments, it further includes a supporting base fixed inside the protective housing 4. The supporting base is located in the first cavity. The current transformer 5 is fixedly connected to the supporting base. The wire passes through the current transformer 5 and is connected to the grounding wire and the protective housing 4. The current transformer 5 is used to measure the leakage current of the support housing 101.

[0137] In some embodiments, the support housings 101 on both sides of the vacuum interrupter are recessed inward. A second cavity is formed between the support housing 101 and the protective housing 4. The second cavity includes:

[0138] A temperature sensor 6 is located on one side of the second cavity close to the vacuum interrupter and is connected to the support housing 101.

[0139] The temperature sensor 6 monitors the operating temperature around the vacuum interrupter in real time. When the temperature exceeds the set threshold, an alarm is issued, enabling the staff to check and maintain the equipment in time, preventing equipment failures caused by overheating, and extending the service life of the equipment.

[0140] The protective housing 4 outside the first cavity and the second cavity can be set as a metal skin 403.

[0141] In this application, the insulating push rod 11 is placed inside the vacuum insulation chamber, which can effectively solve the problem in the prior art that the exposed conductor of the moving conductive rod 20 of the single-bubble vacuum switch tube discharges to the ground along the insulating push rod 11 due to environmental factors such as the temperature, humidity, altitude, and pollution of the external air, realizing isolation from the air environment. Its electrical performance is not affected by changes in the external air environment. Moreover, the first protrusion 2101 and the high-voltage electrode 23 of the static conductive rod 21 are both static rigid structures, and the outside can be integrally cast with solid insulating materials to achieve solid insulation of the live conductor. This can effectively solve the problem of insufficient electrical clearance of the push rod structure of the vacuum switch circuit breaker in high-altitude environments, which leads to discharge, and at the same time enables the vacuum switch circuit breaker to achieve a miniaturized design.

[0142] Through the description of multiple embodiments of the vacuum switch circuit breaker of the present invention, it can be seen that the embodiments of the vacuum switch circuit breaker of the present invention have at least one or more of the following advantages:

[0143] 1. By placing the insulating push rod 11 in the vacuum insulation chamber, the electrical clearance and creepage distance are greatly reduced, the size of the insulating push rod 11 can be reduced, and thus the size of the vacuum switch circuit breaker can be reduced.

[0144] 2. A temperature sensor 6 is provided to monitor the operating state of the vacuum circuit breaker, and a current transformer 5 is used to monitor the leakage current of the support housing 101 of the vacuum circuit breaker to monitor the insulation state.

[0145] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts between the various embodiments, reference can be made to each other.

[0146] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications can still be made to the specific implementation manners of the present invention or equivalent replacements can be made to some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A vacuum switch circuit breaker, characterized in that: include: The housing comprises a protective shell and a supporting shell, wherein the interior of the protective shell is hollow, and the supporting shell is located inside the protective shell and connected to the inner side of the protective shell; A double-tube vacuum bag is located inside the supporting shell and connected to the supporting shell, and includes a vacuum interrupter chamber and a vacuum insulation chamber, and the vacuum interrupter chamber and the vacuum insulation chamber are connected; Wherein, the vacuum interrupter comprises a static conductive rod and a dynamic conductive rod, the static conductive rod comprises a first penetration end and a first contact end, the first penetration end penetrates one end of the vacuum interrupter, the dynamic conductive rod comprises a second penetration end and a second contact end, the second penetration end penetrates the other end of the vacuum interrupter, extends to the vacuum insulation chamber, and penetrates one end of the vacuum insulation chamber, the first contact end of the static conductive rod and the second contact end of the dynamic conductive rod are arranged opposite to each other and spaced apart; The vacuum insulation chamber comprises an insulating push rod, one end of which penetrates the other end of the vacuum insulation chamber, and the other end of the insulating push rod is connected to the second penetration end of the moving conductive rod; The transmission and control mechanism is connected with one end of the insulating push rod.

2. The vacuum switch circuit breaker according to claim 1, characterized in that: The static conductive rod comprises a first protrusion, a second protrusion and a first straight section, the first protrusion is located at the through end of the static conductive rod and outside the vacuum interrupter, the second protrusion is located at the contact end of the static conductive rod and inside the vacuum interrupter, and the first and second protrusions are connected at both ends of the first straight section respectively; The moving conductive rod comprises a third protrusion, a fourth protrusion and a second straight section, the third protrusion is located at the second contact end of the moving conductive rod and is located inside the vacuum interrupter, the fourth protrusion is located at the second penetration end of the moving conductive rod and is located inside the vacuum insulation chamber, the third protrusion and the fourth protrusion are connected to the two ends of the second straight section respectively, and the second straight section penetrates the vacuum interrupter and extends to the inside of the vacuum insulation chamber; Wherein, when the vacuum switch circuit breaker is in the state of breaking current, the third protrusion is arranged opposite to the second protrusion and is spaced apart from it, and when the vacuum switch circuit breaker is in the state of connecting current, the third protrusion is fitted with the second protrusion.

3. The vacuum switch circuit breaker according to claim 2, characterized in that: The vacuum interrupter also includes: The shielding cover is located on both sides of the third protrusion and the second protrusion, and is in an arc shape, with one side connected to the first cylinder and the other side covering the portion opposite to the third protrusion and the second protrusion.

4. The vacuum switch circuit breaker according to claim 1, characterized in that: The vacuum interrupter also includes: The first cylinder is in the shape of a hollow tube, one end of which is connected to the vacuum insulation chamber; A first cover plate is located between the first cylinder and the supporting shell, the edge of the first cover plate is sealedly connected to one end of the first cylinder away from the vacuum insulation chamber, the first through end of the electrostatic guide rod passes through the first cover plate, part of the first through end is located on a side of the first cover plate away from the vacuum insulation chamber, and part of the first through end is located on a side of the first cover plate close to the vacuum insulation chamber; The second cover plate is installed at the junction of the vacuum arc extinguishing chamber and the vacuum insulation chamber, and the second through end of the moving conductive rod passes through the second cover plate.

5. The vacuum switch circuit breaker according to claim 4, characterized in that: The vacuum interrupter also includes: The corrugated tube is wavy in shape, is sleeved on the outer side of the moving conductive rod, and is connected to the second cover plate.

6. The vacuum switch circuit breaker according to claim 5, characterized in that: The vacuum interrupter also includes: The guide sleeve is sleeved on the outer side of the moving conductive rod, located between the moving conductive rod and the corrugated tube, and connected to the second cover plate.

7. The vacuum switch circuit breaker according to claim 1, characterized in that: The double-hose vacuum pack also includes: High voltage electrode, located at the junction of the vacuum interrupter and the vacuum insulation chamber; The soft conductive belt is located inside the vacuum insulation chamber and is bent, with one end connected to the high-voltage electrode and the other end connected to the second through-end of the moving conductive rod.

8. The vacuum switch circuit breaker according to any one of claims 1 to 7, characterized in that: The double-tube vacuum bag is provided with a plurality of openings, and further comprises between the plurality of openings and the supporting shell: The conductor structure is located between the double-tube vacuum bag and the supporting shell. The conductor structure is connected to the supporting shell. A conical opening is provided at the connection between the conductor structure and the supporting shell and on the supporting shell at the connection. One end of the conical opening is connected to the opening on the double-tube vacuum bag. The conductor structure includes: Connector, located at the opening on the double-tube vacuum bag; A pressure equalizing ring is located on the peripheral side of the opening on the double-tube vacuum bag and the peripheral side of the other end of the conical opening; The strap is located on the inside of the tapered opening.

9. The vacuum switch circuit breaker according to any one of claims 1 to 7, characterized in that: A grounding wire is arranged between the supporting shell and the protective shell. The supporting shells located on both sides of the vacuum arc extinguishing chamber are inwardly concave. A first cavity is formed between the supporting shell and the protective shell. The first cavity includes: The current transformer is fixed inside the protective casing and is connected to the protective casing and the grounding wire respectively through wires.

10. The vacuum switch circuit breaker according to any one of claims 1 to 7, characterized in that: The supporting shells located on both sides of the vacuum interrupter are inwardly concave, and a second cavity is formed between the supporting shell and the protective shell. The second cavity includes: The temperature sensor is located at one side of the second cavity close to the vacuum arc extinguishing chamber and is connected to the supporting shell.

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